.page-about {
  --about-rail: 118px;
  background: var(--ds-ink);
  color: var(--ds-warm);
  overflow-x: clip;
}

.page-about .about-topline {
  padding-top: clamp(20px, 4vw, 34px);
}

/* ---------- 首屏拼贴 ---------- */
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  align-items: start;
}

.page-about .about-hero__main {
  padding: clamp(26px, 5vw, 54px) clamp(22px, 4vw, 48px);
  background:
    radial-gradient(120% 92% at 100% 0%, rgba(53, 242, 208, 0.12), transparent 58%),
    linear-gradient(158deg, var(--ds-panel), var(--ds-ink) 74%);
}

.page-about .about-hero__kicker {
  margin: 0 0 18px;
  font-family: var(--ds-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ds-cyan);
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--ds-font-head);
  font-weight: 900;
  font-size: clamp(30px, 5.4vw, 60px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ds-warm);
}

.page-about .about-hero__lead {
  max-width: 60ch;
  margin: 0 0 30px;
  font-size: 17px;
  line-height: 1.7;
  color: rgba(245, 241, 230, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__side {
  display: grid;
  gap: 14px;
}

.page-about .about-hero__chip {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
  padding: 22px 24px;
}

.page-about .about-hero__chip .ds-stat__value {
  font-family: var(--ds-font-mono);
  font-size: clamp(40px, 8vw, 58px);
  font-weight: 700;
  line-height: 1;
  color: var(--ds-cyan);
}

.page-about .about-hero__chip.ds-panel--light .ds-stat__value {
  color: var(--ds-teal);
}

.page-about .about-hero__chip .ds-stat__unit {
  font-family: var(--ds-font-mono);
  font-size: 15px;
  color: var(--ds-moss);
}

.page-about .about-hero__chip .ds-stat__label {
  flex: 1 1 100%;
  margin-top: 4px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--ds-moss);
}

.page-about .about-hero__aside-note {
  margin: 0;
  padding: 4px 2px 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ds-moss);
}

.page-about .about-slant {
  display: block;
  height: 34px;
  margin-top: 40px;
  background: linear-gradient(96deg, transparent 0 18%, var(--ds-teal) 18% 34%, transparent 34% 100%);
  opacity: 0.5;
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  align-items: start;
}

.page-about .about-origin__text .ds-btn {
  margin-top: 26px;
}

.page-about .about-origin__media {
  width: 100%;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-rail__list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 10px 14px;
  border: 1px solid var(--ds-teal);
  border-radius: 2px;
  text-decoration: none;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-rail__year {
  font-family: var(--ds-font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--ds-cyan);
}

.page-about .about-rail__word {
  font-size: 12px;
  color: var(--ds-moss);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--ds-orange);
  background: rgba(255, 138, 61, 0.08);
}

.page-about .about-stack {
  display: grid;
  gap: 20px;
}

.page-about .about-board {
  position: relative;
  padding: clamp(24px, 4vw, 42px);
  scroll-margin-top: calc(var(--ds-header-h) + 26px);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-board:hover {
  transform: translateY(-4px);
}

.page-about .about-board:target {
  outline: 2px solid var(--ds-orange);
  outline-offset: 3px;
}

.page-about .about-board__mark {
  position: absolute;
  top: 22px;
  right: 20px;
}

.page-about .about-board__year {
  margin: 0 0 8px;
  font-family: var(--ds-font-mono);
  font-size: clamp(30px, 6vw, 46px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ds-cyan);
}

.page-about .about-board__title {
  margin: 0 0 14px;
  font-family: var(--ds-font-head);
  font-weight: 800;
  font-size: clamp(19px, 2.6vw, 26px);
  line-height: 1.35;
  color: var(--ds-warm);
}

.page-about .about-board__text {
  max-width: 62ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(245, 241, 230, 0.78);
}

.page-about .about-board__stamp {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
  margin: 22px 0 0;
  padding: 8px 14px;
  background: var(--ds-paper);
  color: var(--ds-ink);
  font-size: 12px;
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.page-about .about-board__stamp strong {
  font-family: var(--ds-font-mono);
  font-size: 15px;
  color: var(--ds-teal);
}

.page-about .about-board:hover .about-board__stamp,
.page-about .about-board:focus-within .about-board__stamp,
.page-about .about-board:target .about-board__stamp {
  opacity: 1;
  transform: none;
}

/* ---------- 流程 ---------- */
.page-about .about-shift__media {
  margin: 0 0 26px;
}

.page-about .about-flow {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-flow__card {
  padding: 26px 24px 22px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-flow__card:hover,
.page-about .about-flow__card:focus-visible {
  transform: translateY(-4px);
}

.page-about .about-flow__num {
  display: inline-block;
  margin-bottom: 14px;
  padding: 4px 10px;
  background: var(--ds-ink);
  color: var(--ds-cyan);
  font-family: var(--ds-font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-flow__title {
  margin: 0 0 12px;
  font-family: var(--ds-font-head);
  font-weight: 800;
  font-size: 19px;
  color: var(--ds-ink);
}

.page-about .about-flow__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(11, 31, 26, 0.78);
}

.page-about .about-flow__role {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(11, 31, 26, 0.25);
  font-family: var(--ds-font-mono);
  font-size: 12px;
  color: var(--ds-teal);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.page-about .about-flow__card:hover .about-flow__role,
.page-about .about-flow__card:focus-visible .about-flow__role {
  opacity: 1;
  transform: none;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
}

.page-about .about-team__chart {
  padding: clamp(22px, 4vw, 34px);
}

.page-about .about-team__chart-title {
  margin: 0 0 18px;
  font-family: var(--ds-font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ds-moss);
}

.page-about .about-team__bar {
  display: flex;
  gap: 4px;
  height: 22px;
  margin-bottom: 22px;
}

.page-about .about-team__seg {
  display: block;
  height: 100%;
}

.page-about .about-team__seg--a {
  flex: 26 1 0;
  background: var(--ds-cyan);
}

.page-about .about-team__seg--b {
  flex: 12 1 0;
  background: var(--ds-orange);
}

.page-about .about-team__seg--c {
  flex: 4 1 0;
  background: var(--ds-yellow);
}

.page-about .about-team__legend {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team__legend-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  color: rgba(245, 241, 230, 0.82);
}

.page-about .about-team__legend-item strong {
  font-family: var(--ds-font-mono);
  font-size: 22px;
  color: var(--ds-warm);
}

.page-about .about-team__dot {
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
}

.page-about .about-team__dot--a { background: var(--ds-cyan); }
.page-about .about-team__dot--b { background: var(--ds-orange); }
.page-about .about-team__dot--c { background: var(--ds-yellow); }

.page-about .about-team__note {
  margin: 22px 0 0;
  font-family: var(--ds-font-mono);
  font-size: 12px;
  color: var(--ds-moss);
}

/* ---------- 合作 ---------- */
.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}

.page-about .about-partners__media {
  margin: 0;
}

.page-about .about-partners__list {
  display: grid;
  gap: 22px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partners__item {
  padding: 20px 22px;
  background: linear-gradient(120deg, rgba(18, 48, 42, 0.9), rgba(6, 18, 15, 0.6));
  border-left: 3px solid var(--ds-teal);
}

.page-about .about-partners__count {
  font-family: var(--ds-font-mono);
  font-size: clamp(30px, 6vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--ds-orange);
}

.page-about .about-partners__label {
  margin-left: 8px;
  font-family: var(--ds-font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--ds-warm);
}

.page-about .about-partners__item p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(245, 241, 230, 0.76);
}

/* ---------- 质量 ---------- */
.page-about .about-quality__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-quality__item {
  position: relative;
  padding: 30px 26px 26px;
}

.page-about .about-quality__index {
  display: block;
  margin-bottom: 14px;
  color: var(--ds-teal);
}

.page-about .about-quality__title {
  margin: 0 0 12px;
  font-family: var(--ds-font-head);
  font-weight: 800;
  font-size: 19px;
  color: var(--ds-ink);
}

.page-about .about-quality__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(11, 31, 26, 0.78);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__inner {
  padding: clamp(26px, 5vw, 50px);
  background:
    linear-gradient(112deg, rgba(53, 242, 208, 0.08), transparent 46%),
    var(--ds-deep);
}

.page-about .about-next__list {
  display: grid;
  gap: 16px;
  margin: 0 0 30px;
  padding: 0;
  list-style: none;
  counter-reset: none;
}

.page-about .about-next__list li {
  padding-left: 22px;
  position: relative;
  font-size: 16px;
  line-height: 1.75;
  color: rgba(245, 241, 230, 0.8);
}

.page-about .about-next__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: 2px;
  background: var(--ds-cyan);
}

.page-about .about-next__list strong {
  color: var(--ds-warm);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-next__tail {
  margin: 24px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ds-moss);
}

/* ---------- 悬浮回跳 ---------- */
.page-about .about-jump {
  position: fixed;
  right: clamp(14px, 3vw, 32px);
  bottom: clamp(14px, 3vw, 30px);
  z-index: 40;
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  background: var(--ds-cyan);
  color: var(--ds-ink);
  font-family: var(--ds-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-decoration: none;
  clip-path: polygon(10px 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%, 0 10px);
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.page-about .about-jump:hover,
.page-about .about-jump:focus-visible {
  transform: translateY(-3px);
  background: var(--ds-orange);
}

/* ---------- 悬停能力缺失时的兜底 ---------- */
@media (hover: none) {
  .page-about .about-board__stamp,
  .page-about .about-flow__role {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-board,
  .page-about .about-flow__card,
  .page-about .about-jump {
    transition: none;
  }
  .page-about .about-board:hover,
  .page-about .about-flow__card:hover,
  .page-about .about-jump:hover {
    transform: none;
  }
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 760px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr);
    gap: 22px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 38px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-quality__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-team__legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 40px;
  }
}

@media (min-width: 900px) {
  .page-about .about-timeline__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 42px;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--ds-header-h) + 30px);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 6px 0 0 18px;
    border-left: 1px solid var(--ds-teal);
  }

  .page-about .about-rail__item {
    position: relative;
    padding: 14px 0;
  }

  .page-about .about-rail__item::before {
    content: "";
    position: absolute;
    left: -23px;
    top: 22px;
    width: 9px;
    height: 9px;
    background: var(--ds-cyan);
    transform: rotate(45deg);
  }

  .page-about .about-rail__link {
    padding: 0;
    border: 0;
    background: none;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: none;
  }

  .page-about .about-rail__link:hover .about-rail__year,
  .page-about .about-rail__link:focus-visible .about-rail__year {
    color: var(--ds-orange);
  }

  .page-about .about-stack > .about-board:nth-child(even) {
    margin-left: 30px;
  }

  .page-about .about-board {
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.42);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 40px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__side {
    margin-top: 42px;
  }

  .page-about .about-stack > .about-board:nth-child(odd) {
    margin-right: 46px;
  }
}